linux-kernel - Re: [PATCH] IB/ucm: fix UCM link error

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Date:   Wed, 22 Aug 2018 09:33:32 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        Matan Barak <matanb@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] IB/ucm: fix UCM link error

On Wed, Aug 22, 2018 at 5:18 AM Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Aug 21, 2018 at 04:20:44PM +0200, Arnd Bergmann wrote:
> > Building UCM with CONFIG_INFINIBAND_USER_ACCESS=m results in a
> > set of link errors including:
> >
> > drivers/infiniband/core/ucm.o: In function `ib_ucm_event_handler':
> > ucm.c:(.text+0x6dc): undefined reference to `ib_copy_path_rec_to_user'
> > drivers/infiniband/core/ucma.o: In function `ucma_event_handler':
> > ucma.c:(.text+0xdc0): undefined reference to `ib_copy_ah_attr_to_user'
> >
> > To get it to build-test again, this makes the option itself a
> > tristate, which lets Kconfig figure out the dependency correctly.
> >
> > Fixes: 486edfb1039d ("IB/ucm: Fix compiling ucm.c")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > ---
> >  drivers/infiniband/Kconfig | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
>
> Applied to for-rc
>
> But that fixes line isn't right is it?
>
> Should it be
>
> commit 7a8690ed6f5346f6738971892205e91d39b6b901
> Author: Leon Romanovsky <leonro@...lanox.com>
> Date:   Wed May 23 08:22:11 2018 +0300
>
>     RDMA/ucm: Mark UCM interface as BROKEN
>
> Which added the config in the first place??

The commit I cited is the one that caused the build regression for me.

The first one (7a8690ed6f) caused the interface to disappear,
the second one (486edfb1039d) brought it back in a way that
fails in some random configurations.

       Arnd